Insulation layer for cables
AssigneeBorealis AG
InventorsKatja Klimke, Dietrich Gloger, Markus Gahleitner, Davide Tranchida, James Ellis Robinson, Ann Watson
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Abstract
The present invention is directed to a new cable having at least one insulation layer, to a process for producing such cable as well as to the use of a soluble a-nucleating agent (NA) for increasing the crystallization temperature of a polymer composition (PC) being part of an insulation layer of such a cable and the use of such a cable as communication cable and/or electrical cable.
Claims15
A cable having at least one insulation layer comprising a polymer composition (PC) consisting of:
- (a) at least 94 wt. %, based on the total weight of the polymer composition (PC), of a crystalline polypropylene (PP) homo- or copolymer having a melt flow rate according to ISO 1133 (230° C./12.16 kg) in the range of 1 g/10 min to 10 g/10 min and a comonomer content of below 5 wt. %, the comonomers are ethylene and/or a C4 to C10 α-olefin,
- (b) 0.5 wt. % to 5 wt. %, based on the total weight of the polymer composition (PC), of an adhesion promoter (AP) being a polar modified polypropylene (PM-PP) homo- or copolymer, and
- (c) 0.02 wt. % to 1 wt. %, based on the total weight of the polymer composition (PC), of a soluble a-nucleating agent (NA).
A process for producing a cable wherein the process comprises the steps of:
- (a) forming a polymer composition (PC) consisting of
- (b) at least 94 wt. %, based on the total weight of the polymer composition (PC), of a crystalline polypropylene (PP) homo- or copolymer having a melt flow rate according to ISO 1133 (230° C./2.16 kg) in the range of 1 g/10 min to 10 g/10 min and a comonomer content of below 5 wt. %, the comonomers are ethylene and/or a C4 to C10 α-olefin,
- (c) 0.5 wt. % to 5 wt. %, based on the total weight of the polymer composition (PC), of an adhesion promoter (AP) being a polar modified polypropylene (PM-PP) homo- or copolymer, and
- (d) 0.02 wt. % to 1 wt. %, based on the total weight of the polymer composition (PC), of a soluble a-nucleating agent (NA),
- (e) applying the polymer composition (PC) of step a) at a melt temperature of 180° C. to 280° C. on a conductor to form an insulation layer, and
- (f) producing the cable at a processing speed of 300 m/min to 3000 m/min.
Dependencies are inferred from the claim text.